Cube the chuck roast into bite-sized pieces. Place in large pot and sprinkle with salt and pepper and sear over medium-high heat on the stove top until browned. Then remove meat from the pot with a slotted spoon and set aside.
Remove the steak and add mushrooms and onions, adding oil or butter if needed. Saute until mushrooms are tender and onions are golden in color. Add garlic and cook for 1-2 minutes, until fragrant. Remove mushrooms, onion, and garlic from pot and set aside.
Letting the pot cool slightly, melt butter on low heat and sprinkle in flour. Whisk continually while flour browns, 2-4 minutes. (flour will burn easily if it is not whisked)
Add beer to the flour mixture and mix to combine. Add beef broth and Worcestershire sauce, fresh thyme, and bay leaf. Add beef, mushrooms, onion, and garlic back into the pot.
Simmer soup for 3 hours, or until beef is tender. (can be cooked longer if needed)
When ready to serve sprinkle in chopped parsley and ladle soup into bowls.